AQA A LEVEL BIOLOGY PAPER 2 Qp

Please write clearly in block capitals. Centre number Candidate number Surname Forename(s) Candidate signature I declare this is my own work. A-level BIOLOGY Paper 2 2 *02* IB/M/Jun20/7402/2 Do not write outside the Answer all questions in the spaces provided. box 0 1 The iris in the human eye is a muscular structure. The iris changes the size of the pupil. Figure 1 shows the muscles in the iris. Figure 1 0 1 . 1 Suggest and explain how the interaction between the muscles labelled in Figure 1 could cause the pupil to constrict (narrow). [2 marks] 3 *03* Turn over ► IB/M/Jun20/7402/2 Do not write outside the 0 1 box . 2 The fovea of the eye of an eagle has a high density of cones. An eagle focuses the image of its prey onto the fovea. Explain how the fovea enables an eagle to see its prey in detail. Do not refer to colour vision in your answer. [3 marks] 0 1 . 3 The retina of the human eye has an area of approximately 1.094 × 103 mm2 The circular fovea in a human eye has a diameter of 3 × 103 µm Calculate the area of the fovea as a percentage of the area of the retina. The area of a circle is πr 2 . Use π = 3.14 in your calculation. Show your working. [2 marks] Answer % Question 1 continues on the next page